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Johnstown (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Johnstown.
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Climate overview of Johnstown
Johnstown, Ontario, Canada, experiences significant temperature variation throughout the year. Summers bring daytime highs of 27°C (81°F) in July, while winters cool to -3°C (27°F) in January.
Rain/snowfall is high, totalling around 1056 mm (42 in) per year. October is the wettest month and March the driest. The city also experiences warm summers and very cold winters.
Johnstown Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Johnstown - and find the best time to visit.
Monthly Temperature in Johnstown
Depending on the time of the year, temperatures range from comfortable to very cold in Johnstown. Average maximum daytime temperatures range from a comfortable 27°C (81°F) in July, the warmest time of the year, to a very cold -3°C (27°F) during cooler months like January.
At night, you can expect temperatures ranging from 16°C (61°F) in July to around -12°C (10°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Johnstown
Johnstown has a relatively rain/snowy climate with high precipitation levels, averaging 1056 mm (42 in) of rain/snowfall annually. While rainfall varies throughout the year, each season offers its own charm. October brings wetter days averaging 118 mm (4.6 in) of precipitation, spread over 16 rainy days.
In contrast, the driest month March experiences a drier climate, with about 61 mm (2.4 in) of snow/rainfall spread across 13 snowy/rainy days. For more details, please visit our Johnstown Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Johnstown
The most comfortable overall weather for exploring Johnstown is usually found in May, August and September. Conditions are generally least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
very cold
Mar
cold
Apr
mixed
May
excellent
Jun
very good
Jul
very good
Aug
excellent
Sep
excellent
Oct
mixed
Nov
cold
Dec
cold
- Best overall: May, August and September
- Warmest weather: July and August
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -12°C (10°F).
Frequently asked questions about the climate in Johnstown
What is the best time to visit Johnstown?
May, August and September typically offer the most optimal weather in Johnstown. In contrast, January, February, March, November and December tend to have less optimal conditions. Johnstown has warm summers and very cold winters.
What temperatures can I expect in Johnstown?
Daytime highs range from -3°C (27°F) in January to 27°C (81°F) in July. Nighttime lows range from -12°C (10°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Johnstown get?
Annual rainfall is around 1056 mm (42 in). October is the wettest month with 118 mm (4.6 in), while March is the driest with 61 mm (2.4 in).
Johnstown 3-Day Forecast
Johnstown on the map
Johnstown is highlighted - select any city to see its climate.
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